Alloy powder special for stainless steel metal hand plate laser 3D printing

Abstract

The invention relates to the field of hand plate manufacturing, in particular to alloy powder for laser 3D printing of a stainless steel metal hand plate, and the alloy powder comprises the following components in percentage by mass: less than or equal to 0.030% of C; si: < = 1.00; mn: < = 2.00; 18.5 to 20.5 parts of Cr (chromium); a metal hand plate obtained through laser 3D printing of the stainless steel powder has high anti-rust capacity due to the fact that 18.5-20.5 of Cr is added in the stainless steel powder, the metal hand plate can not rust within 1-3 months, meanwhile, the hardness can reach 25-30 HRC, all the performance requirements needed by the hand plate are completely met, and compared with 316L stainless steel powder, the stainless steel powder does not contain precious elements Ni and Mo, and is not prone to being damaged. And the cost of the powder is greatly reduced.

Description

Technical Field

[0001] The invention relates to the field of prototype manufacturing, and in particular to an alloy powder specially used for laser 3D printing of stainless steel metal prototypes. Background Art

[0002] Products that have just been designed are generally not perfect, or even unusable. If there are defects in direct production, they will all be scrapped, which greatly wastes manpower, material resources and time. Therefore, products that have just been designed usually need to be prototyped. Prototypes are common industrial products. Prototypes are the first step to verify the feasibility of products. They are the most direct and effective way to find out the defects, deficiencies and drawbacks of the designed products, so as to make targeted improvements to the defects until no deficiencies can be found from the prototypes. Prototypes are generally a small number of samples with a short production cycle and little loss of manpower and material resources. They can quickly find out the deficiencies in product design and then improve them, providing sufficient basis for product finalization and mass production. Prototypes have different materials, such as metal and plastic. Metal prototypes are mainly used for high-strength, durable and high-end models or products. Metal materials mainly include stainless steel, aluminum alloy and titanium alloy. Stainless steel has significant cost advantages over aluminum alloy and titanium alloy, so stainless steel metal prototypes are more widely used.

[0003] At present, most stainless steel metal prototypes are manufactured by laser 3D printing. Laser metal 3D printing technology is an advanced laser additive manufacturing technology developed in recent years. The 3D digital model of the part is sliced ​​and layered through special software. The high-energy laser beam selectively melts the metal powder layer by layer according to the acquired two-dimensional contour data, and forms high-density three-dimensional parts of any shape by layer-by-layer powder laying, layer-by-layer melting, and layer-by-layer solidification accumulation. It has the advantages of fast response speed, short forming time and high material utilization rate. The stainless steel used for laser metal 3D printing is mainly 316L, 420 and CX (Corrax). 420 and CX are mainly used for injection molds. Because the mold requires a certain wear resistance, the laser 3D printed parts of 420 and CX have a higher hardness. If used for prototypes, it is difficult to polish them later, resulting in unsightly prototypes. Therefore, the stainless steel currently used for laser 3D printing prototypes is mainly 316L.

[0004] The main chemical composition (mass percentage) of 316L is: C: ≤0.030; Si: ≤1.00; Mn: ≤2.00; Cr: 16.00~18.00; Ni: 10.00~14.00; Mo: 2.00~3.00; Fe: balance. The main disadvantage of 316L for metal prototype laser 3D printing is that since Ni and Mo are precious elements, the cost of 316L is relatively high. Summary of the invention

[0005] The purpose of the present invention is to provide an alloy powder specially used for laser 3D printing of stainless steel metal prototypes, which can ensure the required performance of the prototypes and significantly reduce the cost of the alloy powder without affecting the use of the prototypes.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is: an alloy powder for laser 3D printing of stainless steel metal prototypes, comprising the following components in mass percentage: C: ≤0.030; Si: ≤1.00; Mn: ≤2.00; Cr: 18.5~20.5; Fe: balance.

[0007] A method for preparing a stainless steel metal prototype laser metal 3D printing powder as described in the above-mentioned component powder comprises the following steps: weighing industrial pure iron, ferrosilicon, metal chromium blocks and pure manganese (electrolytic manganese, etc.) according to a ratio, placing all the raw materials into an induction heating furnace for smelting, and atomizing and sieving after smelting to obtain a stainless steel powder with a particle size of 15-53 μm.

[0008] The obtained stainless steel powder is used for laser 3D printing to obtain a workpiece of the desired shape and size, and then the surface of the workpiece is polished to obtain a metal prototype with beautiful appearance.

[0009] The technical effects of the present invention are: The service life of a prototype is generally less than 3 months. During this period, it is necessary to ensure that the prototype will not rust or bend. The metal prototype obtained by laser 3D printing of the stainless steel powder of this application has a high anti-rust ability due to the added Cr: 18.5-20.5, and can not rust within 3 months. At the same time, the hardness can reach 25-30HRC, which fully meets all the performance requirements required for the prototype. Compared with 316L stainless steel powder, there is no precious elements Ni and Mo, the cost of the powder is greatly reduced, and the reduction of two elements makes the smelting efficiency higher. The alloy powder of this application is used for the production of metal prototypes by laser 3D printing, which has great economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the morphology of the metal powder product of Example 1. DETAILED DESCRIPTION

[0011] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention. Example 1

[0012] An alloy powder for laser 3D printing of stainless steel metal prototypes comprises the following components in mass percentage: C: 0.030; Si: 1.00; Mn: 2.00; Cr: 18.5; Fe: balance.

[0013] A method for preparing a stainless steel metal prototype laser metal 3D printing powder as described in the above-mentioned component powder comprises the following steps: weighing industrial pure iron, ferrosilicon, metal chromium blocks and pure manganese (electrolytic manganese, etc.) according to a ratio, placing all the raw materials into an induction heating furnace for smelting, and atomizing and sieving after smelting to obtain a stainless steel powder with a particle size of 15-53 μm.

[0014] The obtained stainless steel powder is used for laser 3D printing to obtain a workpiece of the desired shape and size, and then the surface of the workpiece is polished to obtain a metal prototype with beautiful appearance. Example 2

[0015] An alloy powder for laser 3D printing of stainless steel metal prototypes comprises the following components in mass percentage: C: 0.020; Si: 0.80; Mn: 1.50; Cr: 20.5; Fe: balance.

[0016] A method for preparing a stainless steel metal prototype laser metal 3D printing powder as described in the above-mentioned component powder comprises the following steps: weighing industrial pure iron, ferrosilicon, metal chromium blocks and pure manganese (electrolytic manganese, etc.) according to a ratio, placing all the raw materials into an induction heating furnace for smelting, and atomizing and sieving after smelting to obtain a stainless steel powder with a particle size of 15-53 μm.

[0017] The obtained stainless steel powder is used for laser 3D printing to obtain a workpiece of the desired shape and size, and then the surface of the workpiece is polished to obtain a metal prototype with beautiful appearance. Example 3

[0018] An alloy powder for laser 3D printing of stainless steel metal prototypes comprises the following components in mass percentage: C: 0.010; Si: 0.50; Mn: 1.00; Cr: 19.5; Fe: balance.

[0019] A method for preparing a stainless steel metal prototype laser metal 3D printing powder as described in the above-mentioned component powder comprises the following steps: weighing industrial pure iron, ferrosilicon, metal chromium blocks and pure manganese (electrolytic manganese, etc.) according to a ratio, placing all the raw materials into an induction heating furnace for smelting, and atomizing and sieving after smelting to obtain a stainless steel powder with a particle size of 15-53 μm.

[0020] The obtained stainless steel powder is used for laser 3D printing to obtain a workpiece of the desired shape and size, and then the surface of the workpiece is polished to obtain a metal prototype with beautiful appearance.

[0021] Comparative Example 316L powder The main chemical components (mass percentage) of 316L are: C: ≤0.030; Si: ≤1.00; Mn: ≤2.00; Cr: 16.00~18.00; Ni: 10.00~14.00; Mo: 2.00~3.00; Fe: balance.

[0022] Use 316L stainless steel powder for laser 3D printing to obtain the workpiece of the required shape and size, and then polish the surface of the workpiece to obtain a metal prototype with beautiful appearance.

[0023] The hardness test of the metal prototypes obtained in Examples 1-3 and the comparative example and the corresponding powder costs were compared to obtain the following table:

[0024] Compared with the comparative example 316L, the embodiments 1-3 of the present application reduce Ni: 10.00-14.00; Mo: 2.00-3.00, and the reduced components are replaced with cheap Fe and cheap corrosion-resistant element Cr. The current market price of Ni: 160 yuan / kg, equivalent to: 1% = 1.6 yuan; Mo: 500 yuan / kg, equivalent to: 1% = 5 yuan; Fe: 5 yuan / kg, equivalent to 1% = 0.05 yuan; Cr: 70 yuan / kg, equivalent to 1% = 0.7 yuan, reducing Ni: 10.00-14.00; Mo: 2.00-3.00 It can save 26-37.4 yuan, while the increased Fe is 0.6-0.85 yuan, and the increased Cr is 1.75 yuan. Comprehensively comparing, the metal powder of the present application, when used specifically for metal prototypes, has a hardness that is basically the same as 316L, and the corrosion resistance can also meet the requirement that the metal prototype will not rust within a 3-month service life. The cost is reduced by at least half compared to the existing laser 3D printing powder 316L. Therefore, in the field of metal prototypes, the alloy powder of the present invention has significant economic value, is worthy of wide promotion, and can effectively and significantly reduce the material cost of prototypes.

[0025] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0026] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. An alloy powder specially used for laser 3D printing of stainless steel metal prototypes, characterized in that: The invention comprises the following components in mass percentage: C: ≤0.030; Si: ≤1.00; Mn: ≤2.00; Cr: 18.5~20.5; Fe: balance.

2. The alloy powder specially used for laser 3D printing of stainless steel metal prototypes according to claim 1 is characterized in that: The steps of making the alloy powder are as follows: Step 1: weigh industrial pure iron, ferrosilicon, metal chromium block and pure manganese according to the proportion; Step 2: Put all the weighed raw materials into an induction heating furnace for smelting. After smelting, atomize and sieve to obtain stainless steel powder with a particle size of 15-53 μm.

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